AXIS Q7900 Installation Guide Page 9ENGLISHPS2 LED - This will indicate a RED light when there is an error in Power supply 2. Please shut downPS2 and replace with a new power supply. It also indicates if PS2 is disconnectedFAN LED - This will indicate if one or more FANS need to be replaced with new ones. Please replacethe fans and reset the fans warning.FANS button - This will reset the fan warning.Power supply 1 and 2 - Replaceable and redundant power supply. 100-240VAC input.Pin assignmentsPin assignments for the RS-485 connector of the AXIS Q7900 RackNote: For RS-485 unit connector information for video encoders, refer to their respective Installation Guide forI/O connector information.Pin AXIS Q7406 AXIS 243Q AXIS 241Q/S, AXIS 240Q12 Channel 6, RS485B NC NC11 Channel 6, RS485A NC NC10 Channel 5, RS485B NC NC9 Channel 5, RS485A NC NC8 Channel 4, RS485B NC NC7 Channel 4, RS485A NC NC6 Channel 3, RS485B NC NC5 Channel 3, RS485A NC NC4 Channel 2, RS485B NC NC3 Channel 2, RS485A NC NC2 Channel 1, RS485B Channel 1, RS485B RS485B1 Channel 1, RS485A Channel 1, RS485A RS485A